digit=[ [75],
        [95,64],
        [17,47,82],
        [18,35,87,10],
        [20,04,82,47,65],
        [19,01,23,75,03,34],
        [88,02,77,73,07,63,67],
        [99,65,04,28,06,16,70,92],
        [41,41,26,56,83,40,80,70,33],
        [41,48,72,33,47,32,37,16,94,29],
        [53,71,44,65,25,43,91,52,97,51,14],
        [70,11,33,28,77,73,17,78,39,68,17,57],
        [91,71,52,38,17,14,91,43,58,50,27,29,48],
        [63,66,04,68,89,53,67,30,73,16,69,87,40,31],
        [04,62,98,27,23, 9,70,98,73,93,38,53,60, 4,23] ]
m=[[0 for L in range(0,len(digit))] for H in range(0,len(digit))]
m[0][0]=digit[0][0]
for i in range(1,len(digit)):
    for j in range(0,i+1):
        if j<i:
            if m[i][j]<m[i-1][j]+digit[i][j]:
                m[i][j]=m[i-1][j]+digit[i][j]
        if j>0:
            if m[i][j]<m[i-1][j-1]+digit[i][j]:
                m[i][j]=m[i-1][j-1]+digit[i][j]
tmp=0
for i in range(0,len(digit)):
    if m[len(digit)-1][i]>tmp:
        tmp=m[len(digit)-1][i]
print tmp










        
